McCAD v1.0 generated void-to-material cell IDs mapping file / Thu Jun  9 14:27:27 2022
File contents: a map of void cell IDs to the material cell IDs contained within.
Column 1 is the void cell ID and column(s) 2(+) is(are) the material cell ID(s).
55    2 3 7 8 9 12 13 14 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54
56    1 2 3 4 5 6 10 11 15 16 17 18 19 20 21 22 23 24 25 26 27 52
